/Engine/Source/Runtime/Engine/Public/MaterialCachedHLSLTree.h
bool GenerateTree ( [UMaterial](API\Runtime\Engine\Materials\UMaterial) * Material, const [FMaterialLayersFunctions](API\Runtime\Engine\Materials\FMaterialLayersFunctions) * LayerOverrides, [UMaterialExpression](API\Runtime\Engine\Materials\UMaterialExpression) * PreviewExpression )